<h1>这里是transition</h1>
<div class="content">
    内容区域
    <button class="btn btn-primary" (click)="showAside()">弹出侧边栏</button>
    <button class="btn btn-success" (click)="hideAside()">隐藏侧边栏</button>
</div>
<div id="aside">
    这是一个侧边栏
</div>